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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c2b3b60d592cab76536add236ff93b2af0b09259cc37f36413183b713e3920' 
  AND token = 'UhrGHfso7qtR5xO313lhfu2uWYpJ+sr8ybkzBZ+8ne4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}